You do the math yourself: every recent review is five stars, but your Google Business Profile still shows 4.8, or worse, 4.6. It feels like Google is either wrong or hiding something, and plenty of owners assume the algorithm is quietly working against them. It usually isn't. Google has a straightforward, published answer for exactly this gap, and a real, documented history behind why the number you calculate and the number Google shows can genuinely disagree.
The short answer
Your Google rating is the average of every star rating your business has ever received, added up and divided by the count, then rounded to one decimal place for display. There is no separate "quality score" quietly pulling the number away from what a calculator would give you. When the number looks wrong, the real cause is almost always timing or scope, meaning Google hasn't finished updating yet, or you and Google are counting a slightly different set of reviews, not a hidden formula.
What Google actually says
Google's own Business Profile help page is blunt about it: "the review score is the average of all ratings published on Google for that place or business." That's the whole formula. There is no mention of recency, reviewer authority, or review length, because none of those factor into the score itself. They can affect which individual reviews Google surfaces first on the page, which is a separate setting from the number. (That sorting question, sometimes labeled "Most relevant", is covered on its own in our guide to how Google picks your most relevant reviews and doesn't touch your score.)
It wasn't always this simple. Until February 2017, Google ran a Bayesian-adjusted average behind the scenes, a statistical method that quietly pulled a business with fewer than ten reviews and a perfect run of five-stars down to something like 4.8 or 4.9, according to GatherUp's coverage of the change. It was arguably more statistically sound, but nobody liked it: owners assumed something was broken, and customers assumed the business had padded its numbers. Google dropped it for the plain average you see today, specifically so the number on screen would match what an owner could work out by hand.
5 real reasons the math looks off
If your own count and Google's number still don't line up, work through these in order. One of them is almost always the answer.
- The rating hasn't finished updating. Google's own stated window is up to two weeks after a new review posts. A batch of new five-stars this week may simply not be folded into the average yet.
- A review was removed after it was already counted. If Google took down a review for violating policy, such as being fake, off-topic, or harassment, its stars drop out of the average retroactively, which can shift your number with no new review ever appearing on your end. See what actually gets removed for the full list of qualifying reasons.
- Rounding hides the real decimal. Google always displays one decimal place. A true average of 4.649 rounds down to 4.6, and 4.65 rounds up to 4.7, small differences that make a hand count look "off" when it's really just rounding.
- You're looking at a stale number. A browser tab left open for hours, a Maps app that hasn't refreshed, or a review widget embedded on your own website can all show a cached snapshot from before your latest reviews landed. Check the live listing, logged out, before assuming the number itself is wrong.
- You and Google aren't counting the same reviews. Star-only ratings with no written text still count fully in the average, even though they're easy to forget when you're mentally tallying "the reviews." A duplicate or recently merged Business Profile can also be carrying reviews you don't see day to day.
“The number on your listing isn't hiding a smarter algorithm. It's arithmetic with a two-week delay.”
What actually moves the number
Because Google's average has been flat and equally weighted since 2017, an old one-star review from three years ago counts exactly as much as the five-star review you got yesterday. Nothing decays on its own. The only way to move a low rating up is to outnumber it: enough new, genuine five-star reviews to pull the average with you, since there's no freshness bonus doing that work for you.
Our free star rating calculator works out exactly how many five-star reviews it takes to move your average from where it sits today to where you want it, using the same flat-average math Google actually runs.
Answering what you already have is the one lever fully in your control while the math catches up. See how to respond to negative reviews for the reviews doing the most damage to your average, and do Google reviews help SEO for how the count and the rating both feed into local ranking, not just the number shoppers see.
If keeping up with replies is the part that keeps slipping, Resparo drafts the everyday replies in your own voice and holds anything sensitive for your approval, so the reviews most likely to move your rating don't sit unanswered. Try a real reply for free with the reply generator, no signup required.